Liquid Crystal Antenna Unit for Reconfigurable 5G Frequency Coverage
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Solution Overview
Problem
The design of 5G terminal antennas is challenging due to non-uniform frequency spectrums globally, requiring antennas with narrow bandwidths that struggle to cover all frequency spectrums effectively.
Innovation Solution
An antenna unit is designed with a liquid crystal layer between two substrates, including a radiation unit layer and a ground layer, and a feed structure layer on a flexible substrate, utilizing aperture coupling and misaligned conductive layers to improve gain and radiation efficiency, allowing for continuous reconfiguration of resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a narrow bandwidth antenna design is used, then the antenna can be optimized for specific frequency, but it cannot cover all frequency spectrums of 5G communication
Solution Approach 1:
The patent employs a liquid crystal layer that can dynamically change its dielectric properties by applying different voltages, allowing the antenna to continuously adjust its resonant frequency and adapt to different 5G frequency bands. This dynamic tuning capability enables a single antenna to cover multiple frequency spectrums that would otherwise require multiple fixed-bandwidth antennas.
2Reliability
If aperture coupling is used to improve gain and radiation efficiency, then antenna performance is enhanced, but the structure becomes more complex with misaligned conductive layers
Solution Approach 1:
The patent introduces a liquid crystal layer as an intermediary between the radiation unit layer and the ground layer, enabling aperture coupling without requiring direct physical contact or precise alignment between conductive layers. The liquid crystal layer mediates the electromagnetic coupling, simplifying the mechanical structure while maintaining high radiation efficiency and gain.
3Reliability
If the liquid crystal cell thickness is not accurately controlled, then manufacturing is easier, but antenna performance becomes unstable
Solution Approach 1:
The patent utilizes the voltage-dependent dielectric properties of liquid crystals to compensate for minor variations in cell thickness. By adjusting the applied voltage, the effective dielectric constant changes, allowing tuning of the resonant frequency to maintain stable antenna performance even when manufacturing tolerances cause slight thickness variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves stable performance, reduces microwave loss, and ensures wide frequency coverage, meeting the requirements for 5G mobile communication devices by accurately controlling the thickness of the liquid crystal cell and using aperture coupling for improved antenna performance.
Implementation Method 1
a liquid crystal layer between the first substrate and the second substrate
Implementation Method 2
utilizing aperture coupling and misaligned conductive layers to improve gain and radiation efficiency
Data Source
AI summary
Provided is an antenna unit, including a first substrate and a second substrate that are oppositely disposed, a liquid crystal layer located between the first substrate and the second substrate, and a third substrate located on a side of the second substrate away from the liquid crystal layer. The first substrate includes a first base substrate and a radiation unit layer. The second substrate includes a second base substrate and a ground layer. The radiation unit layer and the ground layer face the liquid crystal layer. The third substrate includes a third base substrate and a feed structure layer, wherein the feed structure layer is located on a side of the third base substrate away from the second substrate.